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template.go
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template.go
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/*
* Copyright (C) 2020-2021 Joris MASSON
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package adapter
import (
"fmt"
"html/template"
"io"
"path"
"path/filepath"
)
// TemplateExecutor resolves the given relative template paths from the templates/ folder,
// parses the templates from the resolved files and executes them on the given writer.
// It returns an error if a template can't be found or if the execution fails.
type TemplateExecutor interface {
Load(writer io.Writer, data interface{}, templatePaths ...string) error
}
// templateBaseExecutor implements TemplateExecutor for production code
type templateBaseExecutor struct {
basePath string // absolute path to the /templates directory
}
// NewTemplateExecutor creates a new TemplateExecutor
func NewTemplateExecutor(basePath string) TemplateExecutor {
return &templateBaseExecutor{basePath}
}
// Load resolves the given relative template paths from the templates/ folder,
// parses the templates from the resolved files and executes them on the given writer.
// It returns an error if a template can't be found or if the execution fails.
func (t *templateBaseExecutor) Load(writer io.Writer, data interface{}, templatePaths ...string) error {
var cleanedPaths []string
for _, templatePath := range templatePaths {
cleanedPaths = append(cleanedPaths, path.Join(t.basePath, filepath.Clean(templatePath)))
}
tmpl, err := template.ParseFiles(cleanedPaths...)
if err != nil {
return fmt.Errorf("could not load the templates %v: %w", templatePaths, err)
}
err = tmpl.Execute(writer, data)
if err != nil {
return fmt.Errorf("could not execute the templates %v: %w", templatePaths, err)
}
return nil
}